2013/11/23 H. Peter Anvin :
> On 11/22/2013 04:27 AM, Akinobu Mita wrote:
>>
>> I'm currently working for integrating DMA CMA with intel-iommu which
>> I can test. Regardless of which dma ops is actually used, I would
>> like to allocate large contiguous memory with dma_alloc_coherent()
>> and tel
"H. Peter Anvin" writes:
>
> If you have a real iotlb, why would you need contiguous memory?
iotlb is often slow.
Another use case is allocating 1GB pages at runtime.
-Andi
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On 11/22/2013 04:27 AM, Akinobu Mita wrote:
>
> I'm currently working for integrating DMA CMA with intel-iommu which
> I can test. Regardless of which dma ops is actually used, I would
> like to allocate large contiguous memory with dma_alloc_coherent()
> and tell the base address to the device.
2013/11/22 H. Peter Anvin :
> On 11/21/2013 07:02 AM, Akinobu Mita wrote:
>>
>> I want to use DMA CMA for the feature that requires a single huge chunk
>> (about 64MB) of host memory.
>
> That is tautological. "I want to use the Contiguous Memory Allocator to
> allocate contiguous memory."
>
>> Pl
Hello,
On 2013-11-20 00:32, Akinobu Mita wrote:
The DMA Contiguous Memory Allocator support on x86 is disabled when
swiotlb config option is enabled. So DMA CMA is always disabled on
x86_64 because swiotlb is always enabled. This attempts to support
for DMA CMA with enabling swiotlb config opt
On 11/19/2013 03:32 PM, Akinobu Mita wrote:
> The DMA Contiguous Memory Allocator support on x86 is disabled when
> swiotlb config option is enabled. So DMA CMA is always disabled on
> x86_64 because swiotlb is always enabled. This attempts to support
> for DMA CMA with enabling swiotlb config op
2013/11/20 Konrad Rzeszutek Wilk :
> On Wed, Nov 20, 2013 at 08:32:19AM +0900, Akinobu Mita wrote:
>> The DMA Contiguous Memory Allocator support on x86 is disabled when
>> swiotlb config option is enabled. So DMA CMA is always disabled on
>> x86_64 because swiotlb is always enabled. This attempt
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